Slotting machine



De@ 269 E44., E. W. MCKRNNEY SLOTTING MACHINE Filed June 20, 1941 4 .Sheets-Sheet 1 INVENTOR; ELSMERE w. MCKINNEY Dem-26, 1944. E. w. MCKINNEY Y 23552045 SLOTTING MACHINE Filed June 2o, 1941 4 sheets-sheet s ik.: l@

INVENIOR.

Dec., 26u, 1944.. E. w. MCKINNEY `@3611345 SLOTJJING'V MACHINE Filed June 20, 1941 4 Sheets-Sheet 4 INVENTOR. ELSMERE. w. MCKINNEY .from the preceding slot, andicontinuing `the feed g posite orreturn direction.

re'c'tve means 'foripermtting `:insertion and ree `Patented Dec. 26, 1944 PATEN ori-ICE l sLoTTING e J1Elsmere W. McKinney, Cleveland Heights', Dixie,

Lake, :Ohio,.as1trustee assigner ito'W-illiam H. Taylor,

Il/[cntor-onathe- .Appnca'fion June 20, 1941, 'sei-inline. $95,391

Z Claims. This invention relates to an apparatusfor -cut- A ,tingislots .key/ways,` flats, and .the `like,in articles,

:and particularly toanfapparatusfor cutting 1onitudinalslots in thestemsofpoppet valves and `@cylindrical articles.

"For purposes of illustration, theapparatus is described'hereinafter `specifically in connection .the slotting of `poppet valve stems, the use .and `application of the apparatus as ra -Wholeand .of vspecific .sub-combinations thereof .in connec- :being `readily .apparent from `the exemplary disclosure. Likewise, yfor illustrative purposes, the yernlvodiment of` the -invention in` which the valve is fed toa rotating cutter whichremains in `xed position is".dsc1osed, it being understood that the .cutter could be fed tothe valve, if desired.

. One Aof the principal :objects 4.of the present invention is to providea simple and compact lap .paratus Iwhich, when the valve is inserted `and the valve to sink the cutting `tool therein to the .desired depth, then feeds the valve .endwise on .the cutting, stroke `for l cutting ,a slot of the length .and depth desired, .nextstops the endvvisetravel :andmoves the valve out-of engagement with the .eutteigthen returns fthe valveendvvise to starting `position while ,partially indexing the `valve -by rotating Ait .about its axis a portion of uthe total .indexed anglejrequired f or location :of .themext,;A .slot, `then again .moving the valve toward lthe cutter and concurrently rotatingit through A,the remainder .of the `total indexed angle .for `causing `the slot to be properly spaced circumferentially .to sink the cutter and repeat the operation until the required numberof slots are cut,'then` automatically stopping 4the machine `in `proper position to .removeithe slotted valve .and :to insert a valve to be slotted. e e

.Another object .is to provide in `an apparatus of the character described a means effecting rapid.feedlongitndinally of thevalve stem'during the cutting operation and .for efectingwseveral times more rapid return. of :the valve `in -the .op-

@Another object is `to provide a simple land effective indexing means which, fbywthe use of "interchangeable indexing gears, readily remov- -50.:cal adjustment `and the `table `3 `for horizontal adjustmentgparallelto the-axis of ithe spindle 4,

i `tiallyi'spaced fromeachother aroundltheaxisfof `the rstem `a predetermined distance .'apart.

Another object is to `provide `a simple and 'ef- ,tion with otherapparatus and for other purposes .themachine startedautomatically, rst moves e (circo-5m maval ofthe valveffrom the apparatusyet which,

after Vsimply placing the valve in position, :grips .andjrmlyholdsthe valve `so 'thataccuracy in l lengthr and depth of s'lotsand in theirl circum- ,parent ,from the following specification wherein reference is madelto the drawings `invvhch:

i .`Fig.1 is a vertical longitudinal sectional view Ythrough. .the .apparatus ,of the` preser1`t"invention and taken :on line. l-t in Fig. 2;

onlinel--Zinlia "1.; l j

Fig. B :is `a 'side'l'evation of. the controlling :cams ofthe apparatus;

A mig. risa topman view ofthe cams einige; "Figf5 is a fragmentary top plan. view ofthe apparatus as `viewed from the line5-.5 in Figs. 11 andZ;

Figf'? a cross sectional viewof the Work rest taken on `a plane `indicated by the line 'T-L'I in lEigs. '8,9 and lllare diagrammatic `representaltons Aofthe three Lopera'ting A.positions `of the apiparatusf, Eigj .showingthe position at the start .o'fthe cut,IFig.9 showing theposition at the end ofthe .c1it,\,:.and FigfID .showing .the position at the beginning :of thelreturn operation.`

` .llheapparatus with .which `the'inventionlis particularly concerned is mountedon the lbase and .standardof ga .suitable typefof Qmilling machine, :having theusuaitable l which .isadjusta'bie 4ver- -tal ,guideway .L2 ,extending parallel .to the spindle naxis-and.onsvlohlaltable 3jissupportdlfor movement Vforvvardlviarid .rearwardly The spindle Lof .themillingmachne is mount- 40 fedinlantifriction .bearings in a. .suitable `housing .5 .rigidfwiththe .trame .of the machine.Y The .spindle .d .carries.afsuitabletoothed milling `cut- 2 ter Ii lof the desired width .on if desired, .a high speed abrasive cuttingdisc. For .purposes of .il-

lustration asingle cuttenspindle .is shown, but

it is` apparent rthat .by .duplication `of portions .of

e the ;.presentapparatns, a multiple cutter `spindle mayllieused.toincreasethecaiziacity-` Que to `the mountingfof the table 1 for vertianyfdesired Fdepthgfof cut and position `of vcut forwardly :and :rearwardly fof the machine 4can be .iferentialsnacing are assured.

Other objects 4and advantages Will become ap- "Fig 2 is a `vertical cross sectional viewtaken ,.Fi'gfisanenlarged cross sectional view taken` e f .ticany m .suitable guineways Lanchas a horizon..`

article and on' the diameter. The apparatus with which the present invention is particularly concerned comprises a table I mounted in suitable guideways II on the table 3 for movement horizontally in a direction at right angles to the axis of the spindle 4. The table Ill carries a feed screw I2 which is in threaded engagement with a stationary internally threaded collar I3 on the table 3, the collar I3 being modified in a manner to form a part of`a slack eliminator, later to be described.

The feed screw I2 extends the length of the table I0 and is mounted at one end in antifriction axial thrust bearings I4 and, at the opposite end, in a suitable bronze bushing I5. The feed screw I2 carries a gear I6 which is continuously in engagement with a rotatable worm gear I1 which is mounted in the table IIl for travel therewith. The gear I1 is driven through an extensible shaft I8 connected.` by a universal joint I9 to the shaft of vthe worm gear I1 and connected at its opposite end by the universal connection 20 to the driven shaft 2I of a reversible clutch which is 'designated generally at 22.

In the form illustrated, the clutch is one of the well known type havingat one end a high speed driven pulley 23 and at the opposite end a low speed driven pulley 24. The' pulleys 23 and 24 are connected by belts25 and 26 to a high speed driving pulley 21 and a low speed driving pulley 28, respectively. .The pulleys 21 and 28 are continuously driven and, for economy and maintaining an accurate timed relation with the spindle 4, are keyed to the spindle for rotation therewith.

The spindle, in turn, is driven by a pulley 29 connected bya belt 30 to a suitable electric motor or other source of power, (not shown). Thus when the pulleys 21 and 23 'are cooperating, the table is driven at high speed on 'the return stroke which is from left to rightin Fig. l, and when the pulleys 28 and 24 are cooperating, the table is driven atllow speed on the feed stroke which isfrom right to left in Fig. 1. The belt on one set of the pulleys is crossed so that the shaft 2I is driven in reverse directions depending upon the pulley ofthe `clutch which is drivingly engaged. The low speed feed is for cutting and the high speed feed is for return of the table I0 to starting position.

The clutch 22 comprises generally a housing 3l which is shiftable axially of the shaft 2| on a barrel 32 whichis rotatable relative to the housing 3I. The barrel 32 is qmounted in coaxial relation with a pair of sleeves 33 between which and the shaft 2I suitable roller bearings are provided. The sleeves 33 are arrangedin end to end spaced relation. Between the barrel 32 and each sleeve 33 is a helical clutch spring 34. Since both springs and cooperating sleeves are alike in form and function, only the left hand spring in Fig. 2 is described in detail. f

The left hand spring is connected at one end for rotation with the left hand sleeve 33 and its other end extends slightly beyond the barrel 32. A clutch ring 35 is connected by a suitable pin 36 to the barrel 32. kThe ring 35 lies in a suitable groove between the left hand end of the which it engages the free end of the spring 34, thus connecting that end of the spring to the barrel 32 which is always connected for rotation to the shaft 2I. Thus the shaft 2l is driven through the barrel 32, the pin 36, the ring 35, spring 34, and sleeve 33, and its associated pulley 23. By shifting the housing 3I axially of the shaft 2I, driving cooperation between the shaft 2l and the pulleys 23 and 24 can be effected, selectively.

Obviously the feed and return of the table I0 must be in accurately timed relation to the inbarrel 32 and a liange on the left hand sleeve 33 `of the machine.

dexing, later to be described, and, consequently vthe housing 3| is arranged to be shifted from one connection to the other by means of a cam 38` mounted on a shaft 39 which is driven by the extensible shaft 40 to which it is connected `by a universal connection 4I. The opposite end .of the extensible shaft 4i) is connected by universal connection 42 to the indexing shaft 43 The .indexing vshaft 43 is mounted for rotationv in a table 44 which, by virtue of bolts 45 and a cooperating channel 46, can be set in any predetermined adjusted position yalong thetable I0 and made rigid therewith. The indexing shaft carries a segmentally toothed gear 41 having an index retaining lug 48. The teeth of the gear 41 engage an index gear 49. The teeth of the gears 41 and 49 are preferably spiralled on a 45 pitch. Upon driving the gear 41, the teeth thereof cooperate with the teeth of the gear 49 to rotate the gear 49 a predetermined amount` for each rotation of the gear 41, depending upon the number of teeth in the gear 41. The lug 48 is so arranged thatas the segmental teeth have completed their rotation of the gear 49, the lug A48 enters properly positioned radial slots 50 in the gear 49, thus securing the gear firmly in indexed position until there is sufficient subsequent rotation of the gear 41 to re-engage its 4teeth with the gear 49.

The gear 49 is detachably secured to a chuck barrel 5I which is mounted "for rotation in a suit'- vable housing 52 which is rigid with a work table,

positions by means vof a threaded portion 51 vwhich is in engagement with-internal threads in the collar 55, the stop being secured in` its Vadjusted position by a lock nut 58.

A work table 69 is carried on the table 44 for movement therewith and with the table IU. The

table 6I) carries the housing 52 in which the work supporting, holding and indexing mechanism above described is mounted.

In the form illustrated. the table 6I) is connected to the table 44 by means of extensions 6I on the` bearings of the shaft 43, these .bearings being rigidly secured in the table 44. Due to this relation of the table 6D and the shaft 43, the indexing gears maintain their cooperation in all raised and lowered positions of the table 6U and can continue to function during raising and lowering of the table 60, as desired.

In order to raise `and lower the` table 66m The collet is re- "mperrelationtto the'tirningimechanismka rook fleverjhaving a lower arm 62 lanni anfupper larmf$3 Jandpivot yportion A*lill "by whichit is wmounted fin Ythe table (44 isprovided. The arm 613 of'therocker iis Iconnected to lasuitable pivot $5, the `ends of which iaremounted in longitudinal slidesA 66..` The `portionii and at the other end tofastationary anchor bolt'69` on thetable 60 Iso that thesprin'g continuously urgesthe arm `63 in aclcokwise direction, thus urgingthe slidesf'GG to thefextreme right in Fig. 1. The other arm B2 of the roeklever is connected to l`an'opuarating armlllrbyualostmo-` "tion (connection vprovided fthrough the `pivot "H and a cooperatingslot 12 inthe'arm l'150.3ZElie op- `posite'end of the` arm Ulis connected to `acran'k` '313 on the index shawn. 'Thus 4the arm'fro 11s reciprocated inaccordance withthe rotation of the index sliaft`f43.

parallel to the table. `This position fislillustrated i feed, the table being in the raisedipo'sition. li/.isiit The rocking of the crank` .arms E2 and63 aboutthe pivotportionfllraises i Land'lowers the 'table ISU by causing `'the table to 'swing about the axis ofthe index sheftuds in Atimed relation which Will-1a`ter`be described.' 'Swinging ofr theV arm 63 clockwise permits the 'tab1e"`60 toswing downwardly about tlfnaxisto'f` the shaft 43. 1 i H *Mounted on the `table-60 lis `a vijse, designated *generally at 15, which i grips and supports the` opposite end of the article to be slottedytheevise ybeing adjustable `lengthwise Yofthetable 1-60 by bolts "I-B operating `in suitable lkeyways, inthe .e

table 6U; as illustratedlin Figs. 1--1 and 6.` 'The vise comprisesa pair of jaws" whicharelmounted y forsliding movernent toward and away` fro-mieach "other on a" base 18. A` serewf'lQ is 4rotatably "mountedjin thebase'llforfmoving the jawsfupon lrotation of `the l screw,L as fbest illustrated `in i Fig. .-6

and a hand `wheel'fi is' provided `on fthe 'screw tor yrotating the; same, if desred.` Ordinarily, vhow-1 ever, the rotation is effected'bymeans cfa-crank` lleverl xed at one end` to the screwiand atl'the oppositeend to `an extensible rod i182.. Theopposite end `of the rodl82islconnectedltothe slide by a suitable pivotw8`3. The rod182 isso connected `(53 is moved counterclockwiseto `raise thetable NA60, `the fslidelis-rnovedttoward the .vise endfof` fthe table 60, and causes the `rod M to-exerta push on thefcrankfl to rotatefthescrewt'lflsufciently to` tighten 'the vise.- AA compression `spring 84 is *provided between theseotions of theextensible` dexing and lowering and 'lifting of thetable-S,

lacani `85havingoperating pins 85 and B'Iis rigidly `affixed `1go the Ashaft 43 for rotation therewith. `llidjustablymounted on La suitable arm^`88 onthe table 3 of the apparatus ,are cooperating 'hook camsf and 9i).` Adjustmentiofthesecams. along 'thearrn is eiiected by meansof bolts,` Such as ate in undercut keywavs .i in Ithe arm f8.8. The .cam89 `is `rnoimted for `rotation :about sa @indicated atei in Figs. Zande, and-wnienepex` wtravel'sftherealongjrotating the cam 85, lower- `ingtheftablefiairitllreleasing*the:vise 15. Thiemei vthe'llowerfpartof*thefcamt\ on the: pini tf1 so that said pin 86 iis almostvertioally above the rpinllt'l. "At this `time the '-lu'g ld'8 isA still 1' in Imesh 1with"the indexrgeardS-Aandlnoindexing occurs. i e i, nnefro'tatien ofthe-index shaft Maestri-is exi tent rotates the cam `:138 sufficiently Lto 'ki'ok 'fthe clutch housing 31 to the 1e1t` in Fig. Zthus 'connecting the Yhi'gli speedpulley"23` to L' the r pulley 21. lhereupon tnefloweredjtable' isfrea'dytorreturn vrapidly i @This same rotationL-o'f lthe? `shaft- 43 .fhas operated ithe-armlil toswingthefbell crank-arm 6-3fto theright to permit v*the table litolower fand to releasekthe vise 15 Thereuponftheitable starts Irapdly tothe-rightlin Fig, '5l and thecam tpinf 86 engages fthe innert cam :surface `95 on the continues traveling Ato the right, this'cam :and

the-.alpin sa 1 eeeperete te fretate :the shaft-:4c sun `:further untilrtherpinsfare again infiafliorizotal I ipositionwwithpinffl at the rightlliandtside This e `.'Figf `and"lpinv at the lefthandlside. :continued rotation iis tduring @the lostarnoticn :movement of fthe `arm l'l-isothat the table does 'Inotrr-ise. r The movementisfalso sufficient to cause .lftneiindex:gearsItolbeoperatedl'twothirdsfo'ffthe` i :wayitowardttheir desiredlindex i'obvieus1y,`^lthe i i xpassage `fof kthe fpinl fpast the lfree end `for ithe Lbeveledicami isfupermitted'by theswinging outi awardlyf of the f cam-89 whenthe: tablewas moving cam is not beveled in this manner and oncethe pinis iwithinthe hookioffthe cam; it can passout `;.Upon continued movement-tothe righil in lFig. e

' felice,Qtheipin swingingdownwardly 'and-engag- `6.awkwardly;.eatehmglthepinfasewithin tnevneek.

clearsnthenfreewhook end and the cam `swings completes the :nnamhird ofthe indexing, when 4closes fthewiseidisposes*thelug 48 in the next ,sink .the cutter, Lthis i latter `occurring l during the endfoithe-movementroffthe cam. A

' When thel pin -81 lreaches the endfefrits move` `mentalongthe end of the surface S'Lxit isdisposed vertically abovethe pin `8B and,kat'this'timegtrips the clutch to cause the connectionbetweenithe *sbatlwand urgedlintcjthesamepositionrelative shaft 43 until the pins-86 and 81 again occupy their original horizontal plane, whereupon the operation is repeated. During this last rotation of the cam 85, the lug 48 remains in its slot in the index gear and holds the gear in proper indexed position. v

Thus the operations would be repeated indefinitely in sequence were the apparatus to continue operation.

In order to start and the complete sequence of steps necessary for providing all the preselected slots in a given article, a push button type switch is used to start and stop the main driving motor. The stop button IIII of this switch is so positioned as to be engaged and operated by a rock lever |02, mounted on the casing of the switch |00, when the switch end of the rock lever |02 is pressed against the stop button IOI. To effect this operation automatically, the rock lever |02 is provided with a cam surface |03 which is engaged by the end of a pin |04 on the main index gear 49 once for each revolution of the main index gear. This pin is so positioned as to operate the lever and stop the device after the completion of the last slot and lowering of theY table.

To support the valve or article being slotted at a point between the chuckand vise, a work rest, such as illustrated in Fig. '1, is provided. The bridge comprises a rigid upright block of metal |05 which may be secured in desired adjusted positions alongthe table 60 by mean-s of bolts |06. At its upper end the block |05 is bifurcated to provide .spaced arms |01 which are widely -enough separated to accommodate the stem S of the valve therebetween. Supporting screw pins |08 having hardened inner end faces for engaging and supporting the valve stem are adjustably` mounted in the arms |01. The pins or screws |08 are so disposed that when three slots, arranged 120 apart, are to be machined in the valve stem, the stem can be supported by engagement of the pins |08 with the stem above the already slotted portion but below a horizontal plane through the stem axis. would be provided were the pins |08 to engage the stem below the two already formed slots, and consequently flexure and vibration of the stem under the downward force of the cutter are pre.- vented.

As heretofore described, it is necessary for `efficient and fast cutting that all slack be eliminated so that the valve is fed uniformly and with relatively iixed pressure against the cutter. For this purpose the slack eliminator shown herein only. in Fig. l is provided, the slack eliminator being more fully describedand claimed in my Patent 2,311,- 677, issued February 2'3, 1943. In the particular form illustrated herewith, the follower I3, which operates on the feed screw I2, is modiedsomelwhat to provide one part of the slack` eliminator. Since, in the present instance, the feed screw travels with the table I0, the follower I3 is rigidly secured \to the table 3, though it is obvious a follower-might be secured to the table I0 and the worm mounted in fixed longitudinal position on the table 3, the other parts of the slack eliminator being correspondingly reversed.

In modifying the; follower I3, one face IIO thereof is hardened and polished and disposed at 90 toy the axis of the worm feed screw I2. vAdjacent to this .plane face of the follower I3 and spaced slightly therefrom is a follower Il I having a beveled hardened` face II2 facing the face III)k and disposed at an angle of about 5to 8 to stop the apparatus after This affords a more rigid support than the face |I0. The follower III is constrained from rotation with the feed screw I2 by suitable guideways I I3 (one shown) which may be formed in the -table 3 but it is free totravel relative to the table 3 and the table I0 axially of the feed screw I2 except in so far as constrainedby its internal threads engaging the threads of the feed screw I2. Spaced vertical grooves or runways, not shown herein, are provided/in the face `I I2 and accommodate a pair of hardened ball bearings I I5, these ball bearings being capable of rolling along the grooves and maintaining contact with the face IIO. The followers I3 and III act in effect as an axially expansible thread.

I claim:

1. In a metal cutting machine, la rotatable holder for work adapted to have different angularly spaced surfacespresented to a cutter, a

frame for the holder, a supporting table for the Y frame, a pivotal connection between the frame and table vextending transversely ofthe work v holder rotational axis for enablingy swinging movement of the work toward and away from the cutter about the pivotal axis, a shaft coaxial f 'with the pivot, means for turning the shaft, an

indexing gear on the work holder, a complementary indexing gear rigid with the shaft coaxial therewith and engageable with and disengageable from the first mentioned indexing gear,`said gears cooperating intermittently for turning the Work holder into indexed positions upon rotation of the shaft. K

2. Inv a. metal cutting` machine, a rotatable holder for work adapted tovhave different angularly spaced surfaces presented to a cutter, a

frame. -for the holder,.a supporting table for the frame, a guiding connection lbetween the frame and table for enabling movement of the frame in order to carry the work toward and away from the cutter, a shaft rotatably secured to the frame transverse to the rotational axis'of the holder, means for intermittently turning the shaft, an indexing worm gear mechanism connecting the shaft with the work holder and operable during a partial rotation of the shaft and inoperable during a subsequent partial rotation thereof for indexing the work, and mechanism connected with the frame and table and operatively connected to the shaft for operation thereby between indexing operations of the shaft for moving the frame on said guiding connection whereby to move the work relative to the cutter;

y3. In a metal cutting machine, a rotary cutter, a rotary indexing head adapted and arranged to hold a work piece for presentation of angularly spaced surface portions thereof toward the cutter upon predetermined rotation of the head, a pivotal mounting for the head,indexing gearing including a pinion coaxial with the pivot axis and a gear on the head adapted to be driven `by the ,pinion for indexing the work, a crank mechanism on the pinion shaft and means operatively connecting the crank mechanism and support for moving the support toward and away from the tool about the axis of said pivotal mounting upon rotation of the pinion shaft.

4. In a metal cutting machine, a rotary cutter, a rotary indexing head adapted and arranged to hold a Work piece for presentation of angularly spaced surface portions thereof toward the cutter, a |pivotal mounting for the head, indexing gearing including a shaft coaxial with the pivot axis, means forturning the shaft once for each cuttingr operation of the machine, a gear segment on the shaft, and a gear onthe head-adapted to relative to, the cutten during. part.` oi. thelsingle, turnrofs the` shaft, alcranl mechanisrmon. the. sham. and.` means..` `operatively connecting, the crank, mechanism andfsupport for. movinghet support `toward` andaway, .from the.` cutten about., the axis of said pivotal-mountingduringa diff ferenttpartof-,such sing-le turnlof the shaft...

5.` In a metal cutting machine having a; work 'cutter operatingt inxed position,` a. rotatable.. holder for work adapted.. to` have different. angur' larly spaced` surface portions presented to: the;

. 2,356,945 be drivembyy the segment., for. indexing. the; work pie.cea, pivotal mounting for the frame havingy a pivot', axis extending transversely ofthe work axi'sintlie grippedpositi'on ofthe work,means for "swinging, the frameabout the pivot axis in 5,1., opposite directions whereby to enable movement cutter', aframe,fortheholdema bed supporting.`

the table,n1eans for` guidingl the table, onwtlerA bedfon reciprocating movement` transversely of..`

the cutter axis, 'reciprocatingmeansforfthe ta-f l ble, means` connecting` the. frameL and table. in. a-

manner to enable movement .oft thel frame away of`the work` piece/toward andaway from the cutter, wor1`xA gripping mechanism carried on the frame remote from said chuck, means conv nected" with. said* gripping mechanism` and actu" lq; tat'ed'i consequent upon pivotal movement or the frame lin one direction to grip the work and in the opposite Adirection to release the work, and

indexing` mechanism on the" frameV and conf` nect'edft'o the work holderfor `turning the work. 9. In a" metalcutting machine, a rigid work supportffor elongated work' pieces adapted` to be from and toward the table therebyl to .enabler l movement `of the; work` toward and away p from'. thecutter, a shaft ori-,the frametextending trans-t versely of the direction `of movement ,oftheftablef` on @the bed, cam` means on the? shaft, `coopera-tingcam' meansiontheabedl` spaced .along thefta'ble'V guide for intermittentlyrotating theshaftffractional turns during' dilerent portions off; al `corn-- iplete reciprocation of: the table,- any` indexing?M mechanism t connectingthe'A shaft with the-:Work holder" andicperating to? turn; theA work holder incidentlto fractionalturning of `the shaft,` and' means drivingly connected` with the shaft andf frame for `moving the,` frame; toward-1 and;` awayf` cident `to;y fractionaltturning of from the table in the shait.I y l 6: Inf. a; machine .tool f. havirlgl` a"` cutter operating.;N ont` a flxed.`axis, awork usupportfcomprising: as,

presented to' a cutte1means on the Work support' fon; holding the; work in a predetermined position `ontl'ieV supportga table, a pivotal con l.nection between the` support and table on. a pivotaljaxis lextendingjtransversely ofthe work axis, `mechanism' connecting the tableand support forswinging the Support toward and. away from the table aboutsaid pivot axis, said. mechanism includingia slider'. member on the support generallyparalleltojthe axis ofA the Work in said frame and a work-rest mounted onxthewframef and having means' for'supportingazwork piecef in proper position` for; presentation." to': the f cutter;

amounting for the' frame comprising, atable :and:` elevating meansl connectingthe frame to thetapa` ble for lmovement'transverse'. to the: cutterzaxis;`

whereby to` enable movement: ofthetworls;piece:`

toward and awayfrom the cutter, Work gripping: mechanism carried onthe framegland means. con-1 nectedz with said' gripping mechanism and"` actu-f` ated by` the elevating` means while mov-ingthet frame toward'` the `cutter to grip the-work and While moving the release the work.`

for performing a cutting operation cnanelongated Work'- piece, a" work support compris-v ing a frame and a workrest mounted? on theft frame and having means# for'` supporting `suchV elongated work` piece at differentportionss of` itsv length, at pivotal mounting for the frame having apivot` axis transversev to the workaxi's;

means for swinging the frame' ahouti the-'pivoti axis in opposite directionswhereby' towenablefA `frame 1 away from theicutt'er. tol 50 7, In a- .machine` tool havingtacutter adaptedl movement' ofthe work piecetoward:andaway' from the cutter; work' gripping" rnechanisni-` carried on the frame, and means connected withf said gripping mechanism `and actuated'by"they swingingrnovement of the" frame about" salidipi'v ot inonedirection t`o gripthe work` andfintthe opposite direction to release the work.`

` Si Ina machine tool having all cutter adapted-v for `performing cutting operations t on an-l elon'w gated workpiece longitudinally. thereof, ai work support comprising.- a1 frame f and at worki holder' rotatablymounted` thereon fon enablingfturn:-A

ing of the work to present differenti surfacepor-` tionsethere'ofa tol the z cutter;` saidl holder: having` a; chucklfor grippingl onewend t portion ofi: Suchworte:

predeterminedposition thereof andan arm piv oted to` the'` table on axed axis relative` to the table-andconnected tolthe slide member so that the slide memberisfmovedalong the support as the arm. is swungjt'o-move the support, and a grippervise` for the Work, mounted on the. supportl and,operativelyfconnected" to the slide mem-A ber so ast'o 'grip and ,release the work as the slide is .moved in`opposite directions: respectively. 10'; Inra` metal cutting.machine,. an indexing head having a work` gripping device rotatably1 f mountedthereon, a spiral toothed indexing gear d'rivingly `rigid with the gripping device, said gear having slots `circumferentially spaced apart and open'outwardlyofthe gear., a spiral toothed indexinggear segment,` means supporting the segmentv onn an'jaxistransversely of the gear so disposed tliatiteeth` on" the segment can mesh with the indexing gear; and a locking tongue onthe gear segment in angularl'yspacedrelation to thefteethof4 theA gear segment` and so disposed'` as* to enter said" slots ofthe gear in `indexed',positions thereof` when the..gear and segment teeth `,are unmeshed;`

11.,In, a metal' .cutting machine, a turnable gripper'for workto be cut,.a supporting frame for the gripper, indexing gearing on the `frame includingaspiral toothed indexing gear on the` .55.w gripperjanda mutilated spiral toothed indexing pinion on the frame, the axis. of i the. pinion extending at right angles to the axis of said gear andbeingoflset; therefrom in a plane parallel to the ,plane `oi"` the indexing, gear axis and' not intersecting;` said latter; plana, a reciprocable carrier' for their-ame, a. fixed support for the carreLfmeans t'o drive the, carrier. along the suppormarotary cam member rigid with` the indexingpi'nion, a `cooperating cam means on thesupportgsaid camA memberand means coactihg, during` predetermined` portions, of the movement ofthe..` carrierl `to cause the. indexing pinion. to` turn-,the indexing, gear and perform an..ind'exing operatiom, l

supportingiv the Work; holder,VH a` reciprocable carrier, for. the frame-. to; which. theframe ispivotedv om airexisf` transverse-f` to;` the turning 76'? axisz-:ofl the: worlfhp'ldexrsoi: that the.- franie and.

`112., In agmetal cutting. machine,y atrotary Work n cutter..as.turnahly,l mountedW-ork holdena frame work carried by the holder can be swung toward and away from the carrier and the cutter,

a shaft on said pivot axis, indexing gearing con-V nected with the shaft and work holder and operable upon turning of the shaft through a predetermined angle to index the Work holder, mechanism connected with the' shaft and frame to cause Ythe aforesaid swinging movement of the frame upon turning of the shaft, a main support for the reciprocable carrier, means to reciprocate the carrier on the support to feed the work relative to the cutter, and cam mechanism carried in part in generally fixed position on the main support and in part by the shaft, said cam mechanism operating at one end portion of the travel of the carrier to cause the shaft to be turned'a partial rotation to swing the frame and work away from the cutter' and to perform part of an indexing operation, and said cam mechanism operating at the oppositel end portion of the travel of the carrier to complete such indexing operation and swing the 4frame and work toward the cutter.

13. In a metal cutting machine, a cutting element, a work holding element, a reciprocable carriage for one of said elements, a bed for the carriage having a carriage guide thereon, driving mechanism to reciprocate the carriage, said driving mechanism including a rotary driving elementJ which is continually drivingly connected to the carriage, a driving member coaxial with a portion of said driving element, means to turn bed supporting the carriage, a pair of cam *pinsl projecting beyond one end of the shaft and rigid'therewith, 180 apart relative to the shaft axis and which, prior to turning of the shaft, lie

the driving members in opposite directions at different speeds, clutchl mechanism operable to f couple the driving element alternately to said driving members, controlling meansfor the clutchfmechanism partly mounted on the carriage and continually connected to the clutch mechanism by extensible universal drive shaft means for effecting reversal of drive upon actuation of the control means, and actuating means for the control means spaced apart on the bed -and coacting with the control means to reverse the direction of drive at the desired limits of the stroke of the carriage.

14. In a metalcutting machine, a frame and an indexing head mounted for turning movement on the frame, a supporting table for the frame, means guidingly connecting the frame and table for movement of the frame and thereby the head away from and toward the table, a bed having a guide thereon for supporting the table and enabling the table to be moved on the bed transversely of the movement of the frame on the table, means including a reversing gearing conf nected to the table and operable to drive the table in opposite directions along the guide,"a shaft rotatably carried by the table, frame actuating means for moving the frame toward and away from the table, indexing means connected with the indexing head for indexing the head, gear actuating means connected with the gearing for reversing the gearing, said shaft being drivingly connected to said frame actuating means, said indexing meansand said gear actuating means and operating each in timed reend portion of a reciprocation of the car-riage,"1A

in ja common plane parallel to the path of movement of the carriage and coincident with the shaft axis; a cam pivoted on the bed on an axis perpendicular to said common plane and having a hooked cam portion positioned to engage whichever pin is turned out of saidv common plane, said hooked portion` being sWingable about the pivot axis in one direction only out of pin engaging position, yieldingmeans normally holding the hooked portion in pin engaging position, cam means on the bed associated with the pivoted cam and positioned to engage the relatively leading pin as thecarriage moves toward one end of a stroke so as to turn the shaft through such an angle that the other pin is caused toengage said hooked portion, the hooked cam portion having a beveled cam surface so disposed that said other pin pvotally displaces the hooked portion during such angular movement of the shaft and then become latched by the hooked portion, said hooked portion having a cam surface lying within the hook and arranged to move the'latched cam pin into said common plane upon return movement of the carriage.

16. In a machine tool having a milling cut- `ter adapted and arranged for cutting longitudinal radial slots in an elongated work piece of circular cross section, a work holder having means for gripping the vwork piece and indexing the' work piece 120 at each indexing operation, and` means for relatively reciprocating the work and cutter when the cutter is in contact with the. work; a work supporting device in spaced rela-"- tion to the gripping means along the work piece and opposite the region of operation Vof the cutter on the work, and rigid means on the supporting device engaging the Work piece symmetrically with reference tothe radial longitudinal central/plane of a slot being cut in the Work and at regions each less than 120 angularly removed from the slot intercepting portion of said plane about the axis of the Work but more than removed therefrom.

1'?. In a metal cutting machine having a work cutter operating in fixed position, a turnable holder for work adapted to have different angularlyl spaced surface portions presented to the-cutter, a frame for the holder, a reciprocably movable supporting table for the frame, means for guiding the table and reciprocating it, `a pivotal con- .nection between the frame and table extending transversely of the work holder axis and in offset relation thereto whereby the work is movable toward and away from the cutter, a shaft coax ial with the pivot, means rendered operative as a result of reciprocations of the table for intermittently rotating the shaft fractional turns during different terminal portions of a com-- pletev reciprocation of the table, an indexing mechanism connecting the shaft with the work .holder vand operating to index the work holder during fractional turning vof the shaft, and means drivingly connected with the shaft and frame for moving the frame on its pivotal mounting during fractional turning of the shaft,

18. In a machine tool having a rotatable indexing head with an indexing gear thereon pro-` vided with angularly spaced radial slots, a shaft carried by the head transverse to the axis of the indexing gear and having a `gear segment thereon vwith teeth adapted to meshl with the gear and diametrally opposite therefrom,l a gear precisioning tongue adapted to enter the slots in different indexed positions of the gear, areciprocable carrier for the head, a support for the carrier, means to drive the carrier in opposite directions along the support,` cam means drivingly rigid with shaft, and two cam `members in spaced relation to each other along the supportparallel to the path of movement of the carrier there-` form a partial indexing operation, and the other l cam member cooperating with said cam means at the opposite end of such stroke to turn the,

shaft and complete such indexing operation "and cause the tongue to `engage another slot of the indexing'gear.

\ 19. In a metal cutting machina-a rotary work cutter, a turnably mounted work holder, a frame supporting the holder, al reciprocable carrier for the frame to which the frame is pivoted on an axis transverse to the turning axis of` the work holder so that the frame and Work carried by the holder can be swung toward and away from the carrier and the cutter, a shaft on said pivot axis, mechanism connected with the shaft and frame to cause the aforesaid swinging movement of the frame upon turning of the shaft, a main support for the reciprocablecarrier, means to reciprocate the carrier on the support to feed the work relative to the cutter, and cam mechanism tion of the travel of the carrier to turn the shaft through another partial rotation and swing the frame and work toward the cutter, an index gear on the work holder and a segmental index pinion on the shaft adapted to mesh therewith during `partial turning of the shaft to turn the work` holder.

20. In a metal cutting machine, a frame and an indexing head mounted for turning movement on the frame, indexing mechanism connected therewith, a supporting table for` the carried in part in fixed position on the main support and in part by the shaft, said cam mechanism operating at `one endjportion of the travel of the carrier to 'cause the shaft to be turned frame, means guidingly connecting the` frame and table for movement of theframe and thereby the head away from andV toward the table, jacking mechanism connecting the frame and table for effecting such movement of the frame, a bed having a guide thereon for supporting the table and enabling the table to be moved on the bed transversely of the movement `of the frame on the table, means including a reversing gearing drivingly connected to `thetable and operable to drive the table in opposite directions along the guide and an actuating mechanism for reversing the driving operation of the gearing, a master operating member rotatably carried by the table on an axis extending transversely of the table movement on the bed, coacting cam means on the bed and master member, respectively, operable to turn the member incident to reciprocation of the table along the bed, and

operating connections between said member and each ofthe aforesaid mechanisms.

ELSMERE W. `MCKINNEY.

n l 7 a partial rotation whereby to swing the frame and Work away from the cutter, and said cam mechanism operating at the opposite end por- 

